a)-300

b)500

a ) 200 - 30 x 20 + 100

=   200 - 600 + 100

=  -300

b ) 200 - 300 + 20 x 30

= 200 - 300 + 600

= 100 + 600 

= 700

Tính giá trị biểu thức sau :

a ) 200 - 30 x 20 + 100

= 200 - 600 + 100

= - 400 + 100

= - 300

b ) 200 - 300 + 20 x 30

= 200 - 300 + 600

= - 100 + 600

= 500

30+30+40+100+200+100=500

30 + 30 + 40 + 100 + 200 + 100 = 500

k mình nhé , mình k lại

a) x +60+40 =400

   x             = 400-40-60

   x             =300

b) (x+25) + 50 = 100:2 +30

(x+25) +50     = 50+30=80

x+25             = 80-50=30

x                   =30-25

x                  = 5

a.x+60+40=200

x+100=200

x=200-100

x=100

b.x+25+50=100:2+30

x+75=50+30

x+75=80

x=80-75

x=5

mk nhanh nhất

a) x + 100 = 200

    x           = 200 - 100

    x           = 100

b) x + 25 + 50 = 50 + 30

    x + 75          = 80

    x                  = 80 - 75

    x                  = 5

a) \(2^{x+2}-2^2=96\)

 <=> \(2^x.2^2-2^x=96\)

 <=> \(2^x\left(4-1\right)=96\)

<=> \(3.2^x=96\)

<=> \(2^x=32\)

<=> \(2^x=2^5\)

<=> x = 5 

b, \(x-\left(\frac{50x}{100}+\frac{25x}{200}\right)=11\frac{1}{4}\)

\(\Rightarrow x-\left(\frac{1x}{2}+\frac{1x}{8}\right)=\frac{45}{4}\)

\(\Rightarrow x-\left(\frac{4x}{8}+\frac{1x}{8}\right)=\frac{45}{4}\)

\(\Rightarrow x-\frac{5x}{8}=\frac{45}{4}\)

\(\Rightarrow\frac{8x}{8}-\frac{5x}{8}=\frac{45}{4}\)

\(\Rightarrow\frac{3x}{8}=\frac{45}{4}\Rightarrow x=\frac{45}{4}\div\frac{3}{8}=30\)

Vậy x = 30 

100 - 200 + 30 - 7 + 27 - 100 + 300 - 20 + 30 = 160

Ủng hộ mình lên 0 điểm nha

1234567890

Duyệt đi

100 - 200 + 30 - 7 + 27 - 100 + 300 - 20 + 30 = -100 + 30 - 7 + 27 - 100 + 300 - 20 + 30

= -70 - 7 + 27 - 100 + 300 - 20 + 30

= -77 + 27 - 100 + 300 - 20 + 30

= -50 - 100 + 300 - 20 + 30

= -150 + 300 - 20 + 30

= 150 - 20 + 30

= 130 + 30

= 160

100 + ( 100 - 100 ) =100  

 200 + ( 1000000- 100000 )=900200

300 - ( 200- 100 ) =200

30 + ( 22 : 2 ) =41

100 + (100 - 100)

= 100 + 0

= 100

200 + (1000000 - 100000)

= 200 + 900000

= 900200

300 - (200 - 100)

= 300 - 100

= 200

30 + (22 : 2)

= 30 + 11

= 41

100 + (100 - 100 )

= 100 + 0

= 100

200 + (1000000 - 100000)

= 200 + 900000

= 900200

300 - (200 - 100)

= 300 - 100

= 200

30 + (22 : 2)

= 30 + 11

= 41

a

b

a)x=30

b)x=65

a) x-\(\left(\frac{50x}{100}+\frac{25x}{200}\right)\)=\(11\frac{1}{4}\)

<=>x - \(\frac{1}{2}x-\frac{1}{8}x\)=\(\frac{11.4+1}{4}\)

<=>\(\frac{3}{8}x=\frac{45}{4}\)

<=>x=\(\frac{45}{4}:\frac{3}{8}\)

<=>x=30

Vậy x=30

c) (x-5).\(\frac{30}{100}\)=\(\frac{20x}{100}+5\)

<=>(x-5).\(\frac{3}{10}\)=\(\frac{x}{5}\)+5

<=>\(\frac{3x}{10}-\frac{15}{10}=\frac{x}{5}+5\)

<=>\(\frac{3x}{10}-\frac{x}{5}=5+\frac{15}{10}\)

<=>\(\frac{x}{10}=\frac{13}{2}\)

<=>x=\(\frac{13.10}{2}\)

<=>x=65

Vậy: x=65

59

59

200

400

29+30=59                        30+29=59

100+100=200                    200+200=400

29+30=59                    30+29=59

100+100 =200                   200+200=400